I suspect that a loose connection has, over time, overheated and is now burned away to a whisker. It might be in the plug or the socket or the consumer unit. If there is a junction box that may well be where the fault is.

If the socket is on a ring, it is more likely in the socket, especially if the plug is a factory fitted one and the cable connection at the oven is a factory fitted block.

When you say "oven" and that it is on a plug, I presume it is a single built-in oven, not a cooker or a double oven.

I suspect that a loose connection has, over time, overheated and is now burned away to a whisker. It might be in the plug or the socket or the consumer unit. If there is a junction box that may well be where the fault is.

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Socket has a separate circuit breaker in fuse box.

If the socket is on a ring, it is more likely in the socket, especially if the plug is a factory fitted one and the cable connection at the oven is a factory fitted block.

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My son said he opened the plug to check the wiring and fuse so I assume it's not a factory fitted plug as they are usually moulded. He said wiring looked fine and did not change the fuse. When switched back on the grill worked and he was able to cook his sausages.

When you say "oven" and that it is on a plug, I presume it is a single built-in oven, not a cooker or a double oven.